Drawing instrument



FIG. 1 is a front elevational view of a drawing instrument showing our new design;

FIG. 2 is a top edge view;

FIG. 3 is a bottom edge view;

FIG. 4 is a left side elevational view; and,

FIG. 5 is a right side elevational view thereof. 

The ornamental design for a drawing instrument, as shown and described. 